android输入框输入价格，小数点后留两位简单实现

正好碰到这种情况，就记录下来吧，实现起来很简单

<EditText
android:id="@+id/id_edit"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical|right"
android:numeric="integer"
android:text="0.00" />

public class MainActivity extends Activity {
EditText edit;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

edit = (EditText) findViewById(R.id.id_edit);
edit.addTextChangedListener(new TextWatcher() {
private boolean isChanged = false;

@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
// TODO Auto-generated method stub
}

@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}

@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
if (isChanged) {// ----->如果字符未改变则返回
return;
}
String str = s.toString();

isChanged = true;
String cuttedStr = str;
/* 删除字符串中的dot */
for (int i = str.length() - 1; i >= 0; i--) {
char c = str.charAt(i);
if ('.' == c) {
cuttedStr = str.substring(0, i) + str.substring(i + 1);
break;
}
}
/* 删除前面多余的0 */
int NUM = cuttedStr.length();
int zeroIndex = -1;
for (int i = 0; i < NUM - 2; i++) {
char c = cuttedStr.charAt(i);
if (c != '0') {
zeroIndex = i;
break;
}else if(i == NUM - 3){
zeroIndex = i;
break;
}
}
if(zeroIndex != -1){
cuttedStr = cuttedStr.substring(zeroIndex);
}
/* 不足3位补0 */
if (cuttedStr.length() < 3) {
cuttedStr = "0" + cuttedStr;
}
/* 加上dot，以显示小数点后两位 */
cuttedStr = cuttedStr.substring(0, cuttedStr.length() - 2)
+ "." + cuttedStr.substring(cuttedStr.length() - 2);

edit.setText(cuttedStr);

edit.setSelection(edit.length());
isChanged = false;
}
});
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}